Many other new techniques are now available that enable more research to..请帮忙分析句子结构完整句子:Many other new techniques are now available that enable more research to be done in the test tube to see if chemicals produce harmful

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Many other new techniques are now available that enable more research to..请帮忙分析句子结构
完整句子:Many other new techniques are now available that enable more research to be done in the test tube to see if chemicals produce harmful biological effects.
请问这句话最主干的主语、谓语和宾语是什么?

1、句子主干结构:
【Many other new techniques 主语,定语从句先行词】【are 谓语】now【 available表语】 【that enable more research to be done in the test tube 分隔式定语从句】【 to see if chemicals produce harmful biological effects 不定式短语,目的状语】.
这里难点是【分隔式定语从句】.使用的原因是:定语从句内容过长,还带有目的状语,且目的状语中还含有if宾语从句.如果用成正常定语从句,句子主干结构被分得太开而不易理解——
【Many other new techniques主语】 【that enable more research to be done in the
test tube 定语从句】【are 谓语】now【 available表语】 【to see if chemicals produce
harmful biological effects 不定式短语,目的状语】.
2、从句结构:
①定语从句
【that 关系词,从句主语】【 enable 谓语】【 more research宾语 】【to be done in the test tube 不定式短语,宾语补足语】
② if宾语从句
if 【chemicals主语】【 produce谓语】【 harmful biological effects宾语】
祝你开心如意!

这句话不是主谓宾结构而是主系表结构,Many other new techniques 做主语,are是系动词, available 是表语, that 引导状语从句。

techniques are available这是主语+系动词+表语的结构
that后面整一句从句用来修饰前面整个主句